forked from OSchip/llvm-project
156 lines
4.8 KiB
LLVM
156 lines
4.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -disable-output -print-mustexecute %s 2>&1 | FileCheck %s
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define i1 @header_with_icf(i32* noalias %p, i32 %high) {
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; CHECK-LABEL: @header_with_icf(
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; CHECK-LABEL: loop:
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; CHECK: %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ] ; (mustexec in: loop)
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; CHECK: %v = load i32, i32* %p ; (mustexec in: loop)
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; CHECK: call void @maythrow_and_use(i32 %v) ; (mustexec in: loop)
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; CHECK-NOT: mustexec
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entry:
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br label %loop
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loop:
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%iv = phi i32 [0, %entry], [%iv.next, %loop]
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%v = load i32, i32* %p
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call void @maythrow_and_use(i32 %v)
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%iv.next = add nsw nuw i32 %iv, 1
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%exit.test = icmp slt i32 %iv, %high
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br i1 %exit.test, label %exit, label %loop
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exit:
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ret i1 false
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}
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define i1 @split_header(i32* noalias %p, i32 %high) {
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; CHECK-LABEL: @split_header(
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; CHECK-LABEL: loop:
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; CHECK: %iv = phi i32 [ 0, %entry ], [ %iv.next, %next ] ; (mustexec in: loop)
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; CHECK: %v = load i32, i32* %p ; (mustexec in: loop)
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; CHECK: br label %next ; (mustexec in: loop)
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; CHECK-NOT: mustexec
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entry:
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br label %loop
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loop:
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%iv = phi i32 [0, %entry], [%iv.next, %next]
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%v = load i32, i32* %p
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br label %next
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next:
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call void @maythrow_and_use(i32 %v)
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%iv.next = add nsw nuw i32 %iv, 1
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%exit.test = icmp slt i32 %iv, %high
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br i1 %exit.test, label %exit, label %loop
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exit:
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ret i1 false
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}
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; FIXME: everything in inner loop header should be must execute
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; for outer as well
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define i1 @nested(i32* noalias %p, i32 %high) {
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; CHECK-LABEL: @nested
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; CHECK-LABEL: loop: ; preds = %next
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; CHECK: %iv = phi i32 [ 0, %entry ], [ %iv.next, %next ] ; (mustexec in: loop)
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; CHECK: br label %inner_loop ; (mustexec in: loop)
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; CHECK-LABEL: inner_loop:
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; CHECK: %v = load i32, i32* %p ; (mustexec in: inner_loop)
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; CHECK: %inner.test = icmp eq i32 %v, 0 ; (mustexec in: inner_loop)
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; CHECK: br i1 %inner.test, label %inner_loop, label %next ; (mustexec in: inner_loop)
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; CHECK-NOT: mustexec
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entry:
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br label %loop
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loop:
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%iv = phi i32 [0, %entry], [%iv.next, %next]
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br label %inner_loop
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inner_loop:
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%v = load i32, i32* %p
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%inner.test = icmp eq i32 %v, 0
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br i1 %inner.test, label %inner_loop, label %next
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next:
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call void @maythrow_and_use(i32 %v)
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%iv.next = add nsw nuw i32 %iv, 1
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%exit.test = icmp slt i32 %iv, %high
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br i1 %exit.test, label %exit, label %loop
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exit:
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ret i1 false
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}
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; FIXME: everything in inner loop header should be must execute
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; for outer as well
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define i1 @nested_no_throw(i32* noalias %p, i32 %high) {
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; CHECK-LABEL: @nested_no_throw
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; CHECK-LABEL: loop: ; preds = %next
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; CHECK: %iv = phi i32 [ 0, %entry ], [ %iv.next, %next ] ; (mustexec in: loop)
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; CHECK: br label %inner_loop ; (mustexec in: loop)
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; CHECK-LABEL: inner_loop:
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; CHECK: %v = load i32, i32* %p ; (mustexec in: inner_loop)
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; CHECK: %inner.test = icmp eq i32 %v, 0 ; (mustexec in: inner_loop)
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; CHECK: br i1 %inner.test, label %inner_loop, label %next ; (mustexec in: inner_loop)
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; CHECK-LABEL: next:
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; CHECK: %iv.next = add nuw nsw i32 %iv, 1 ; (mustexec in: loop)
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; CHECK: %exit.test = icmp slt i32 %iv, %high ; (mustexec in: loop)
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; CHECK: br i1 %exit.test, label %exit, label %loop ; (mustexec in: loop)
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entry:
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br label %loop
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loop:
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%iv = phi i32 [0, %entry], [%iv.next, %next]
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br label %inner_loop
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inner_loop:
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%v = load i32, i32* %p
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%inner.test = icmp eq i32 %v, 0
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br i1 %inner.test, label %inner_loop, label %next
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next:
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%iv.next = add nsw nuw i32 %iv, 1
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%exit.test = icmp slt i32 %iv, %high
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br i1 %exit.test, label %exit, label %loop
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exit:
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ret i1 false
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}
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; Since all the instructions in the loop dominate the only exit
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; and there's no implicit control flow in the loop, all must execute
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; FIXME: handled by loop safety info, test it
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define i1 @nothrow_loop(i32* noalias %p, i32 %high) {
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; CHECK-LABEL: @nothrow_loop(
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; CHECK-LABEL: loop:
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; CHECK: %iv = phi i32 [ 0, %entry ], [ %iv.next, %next ] ; (mustexec in: loop)
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; CHECK: br label %next ; (mustexec in: loop)
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; CHECK-LABEL: next:
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; CHECK: %v = load i32, i32* %p ; (mustexec in: loop)
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; CHECK: %iv.next = add nuw nsw i32 %iv, 1 ; (mustexec in: loop)
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; CHECK: %exit.test = icmp slt i32 %iv, %high ; (mustexec in: loop)
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; CHECK: br i1 %exit.test, label %exit, label %loop ; (mustexec in: loop)
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; CHECK-NOT: mustexec
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entry:
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br label %loop
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loop:
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%iv = phi i32 [0, %entry], [%iv.next, %next]
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br label %next
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next:
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%v = load i32, i32* %p
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%iv.next = add nsw nuw i32 %iv, 1
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%exit.test = icmp slt i32 %iv, %high
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br i1 %exit.test, label %exit, label %loop
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exit:
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ret i1 false
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}
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declare void @maythrow_and_use(i32)
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